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Impurities

SynThink is a trusted producer and supplier of Pharmaceutical Reference Standards, including Impurity Standards. These materials are essential for pharmaceutical companies conducting research into the quality, stability, and biological safety of drug products. We maintain a robust inventory of API impurities, ready to support your development and regulatory needs.

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Ascorbic Acid, Impurities

Ascorbic Acid EP Impurity A

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CAS No.

: 98-01-1

Mol F.

: C5H4O2

Mol W.

: 96.08

Cat No.

: SA21503

Ascorbic Acid, Impurities

Ascorbic Acid EP Impurity C

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CAS No.

: 21675-47-8

Mol F.

: C6H10O7

Mol W.

: 194.14

Cat No.

: SA21504

Ascorbic Acid

Ascorbic Acid EP Impurity D

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CAS No.

: 67776-07-2

Mol F.

: C7H12O7

Mol W.

: 208.17

Cat No.

: SA21505

Ascorbic Acid, Impurities

Ascorbic Acid EP Impurity E

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CAS No.

: 144-62-7

Mol F.

: C2H2O4

Mol W.

: 90.03

Cat No.

: SA21506

Ascorbic Acid, Impurities

Ascorbic Acid EP Impurity F

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CAS No.

: 89-65-6

Mol F.

: C6H8O6

Mol W.

: 176.12

Cat No.

: SA21500

Ascorbic Acid, Impurities

Ascorbic Acid EP Impurity G

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CAS No.

: 66757-69-5

Mol F.

: C6H6O7

Mol W.

: 190.11

Cat No.

: SA21507

Ascorbic Acid, Impurities

Ascorbic Acid EP Impurity H

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CAS No.

: 122046-79-1

Mol F.

: C7H8O7

Mol W.

: 204.13

Cat No.

: SA21501

Aspirin, Impurities

Aspirin; Acetylsalicylic Acid

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CAS No.

: 50-78-2

Mol F.

: C9H8O4

Mol W.

: 180.16

Cat No.

: SA28505

Atenolol, Impurities

Atenolol

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CAS No.

: 29122-68-7

Mol F.

: C14H22N2O3

Mol W.

: 266.34

Cat No.

: SA33600

Atenolol, Impurities

Atenolol EP Impurity A

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CAS No.

: 17194-82-0

Mol F.

: C8H9NO2

Mol W.

: 151.16

Cat No.

: SA33601

Atenolol, Impurities

Atenolol Ep Impurity B

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CAS No.

: 61698-76-8

Mol F.

: C11H15NO4

Mol W.

: 225.24

Cat No.

: SA33602

Atenolol, Impurities

Atenolol EP Impurity C

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CAS No.

: 29122-69-8

Mol F.

: C11H13NO3

Mol W.

: 207.23

Cat No.

: SA33603

Atenolol, Impurities

Atenolol EP Impurity D

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CAS No.

: 115538-83-5

Mol F.

: C11H14ClNO3

Mol W.

: 243.69

Cat No.

: SA33604

Atenolol, Impurities

Atenolol EP Impurity E

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CAS No.

: 141650-31-9

Mol F.

: C19H22N2O5

Mol W.

: 358.39

Cat No.

: SA33605

Atenolol, Impurities

Atenolol EP Impurity F

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CAS No.

: 87619-83-8

Mol F.

: C25H35N3O6

Mol W.

: 473.56

Cat No.

: SA33606

Atenolol, Impurities

Atenolol EP Impurity G

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CAS No.

: 56392-14-4

Mol F.

: C14H21NO4

Mol W.

: 267.32

Cat No.

: SA33607

Atenolol, Impurities

Atenolol EP Impurity H

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CAS No.

: 29277-73-4

Mol F.

: C14H20N2O2

Mol W.

: 248.32

Cat No.

: SA33608

Atenolol, Impurities

Atenolol EP Impurity I

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CAS No.

: 1797116-92-7

Mol F.

: C13H20N2O3

Mol W.

: 252.31

Cat No.

: SA33609

Atomoxetine, Impurities

Atomoxetine 3-Fluoro Impurity Racemate

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CAS No.

: NA

Mol F.

: C17H21ClFNO

Mol W.

: 309.81

Cat No.

: SA22109

Atomoxetine, Impurities

Atomoxetine 4-Hydroxy Impurity

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CAS No.

: 435293-66-6

Mol F.

: C17H21NO2

Mol W.

: 271.35

Cat No.

: SA22110

Atomoxetine, Impurities

Atomoxetine Chloro Impurity

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CAS No.

: 114446-47-8

Mol F.

: C16H17ClO

Mol W.

: 260.76

Cat No.

: SA22111

Atomoxetine, Impurities

Atomoxetine EP Impurity A

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CAS No.

: 873310-33-9(HCl);56161-70-7(base)

Mol F.

: C16H20ClNO

Mol W.

: 277.79

Cat No.

: SA22101

Atomoxetine, Impurities

Atomoxetine EP Impurity B

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CAS No.

: 82857-39-4

Mol F.

: C17H22ClNO

Mol W.

: 291.82

Cat No.

: SA22102

Atomoxetine, Impurities

Atomoxetine EP Impurity C

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CAS No.

: 1643684-06-3

Mol F.

: C17H22ClNO

Mol W.

: 291.82

Cat No.

: SA22103

Atomoxetine, Impurities

Atomoxetine EP Impurity D

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CAS No.

: 873310-28-2

Mol F.

: C17H22ClNO

Mol W.

: 291.82

Cat No.

: SA22104

Atomoxetine, Impurities

Atomoxetine EP Impurity E

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CAS No.

: 17199-29-0

Mol F.

: C8H8O3

Mol W.

: 152.15

Cat No.

: SA22105

Atomoxetine, Impurities

Atomoxetine EP Impurity F

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CAS No.

: 1010818-92-4

Mol F.

: C17H21ClFNO

Mol W.

: 309.81

Cat No.

: SA22106

Atomoxetine, Impurities

Atomoxetine EP Impurity G

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CAS No.

: 2706536-33-4

Mol F.

: C27H34N2O2

Mol W.

: 418.57

Cat No.

: SA22107

Atomoxetine, Impurities

Atomoxetine EP Impurity H

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CAS No.

: 42142-52-9

Mol F.

: C10H15NO

Mol W.

: 165.23

Cat No.

: SA22108

Atomoxetine, Impurities

Atomoxetine HCl

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CAS No.

: 82248-59-7

Mol F.

: C17H22ClNO

Mol W.

: 291.82

Cat No.

: SA22112

Atomoxetine, Impurities

Atomoxetine HCl Racemate

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CAS No.

: 82857-40-7

Mol F.

: C17H22ClNO

Mol W.

: 291.82

Cat No.

: SA22113

Atomoxetine, Impurities

Atomoxetine m-Methyl Racemate

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CAS No.

: 873310-29-3 (FreeBase)

Mol F.

: C17H22ClNO

Mol W.

: 291.82

Cat No.

: SA22114

Atomoxetine, Impurities

Atomoxetine N-Desmethyl Impurity

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CAS No.

: 881995-46-6

Mol F.

: C16H20ClNO

Mol W.

: 277.79

Cat No.

: SA22115

Atorvastatin, Impurities

Atorvastatin (3S,5R)-Isomer Methyl Ester

$500.00 50 mg

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CAS No.

: 1429437-85-3

Mol F.

: C34H37FN2O5

Mol W.

: 572.67

Cat No.

: SA17819

Atorvastatin, Impurities

Atorvastatin 2-Hydroxy

$2,500.00 100 mg

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CAS No.

: 214217-86-4 (acid); 265989-46-6 (Salt)

Mol F.

: C33H35FN2O6

Mol W.

: 574.64

Cat No.

: SA17821

Atorvastatin, Impurities

Atorvastatin 3-Oxo Acid

$2,100.00 100 mg

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CAS No.

: 1391052-00-8 (Salt)

Mol F.

: C33H33FN2O5

Mol W.

: 556.62

Cat No.

: SA17822

Atorvastatin, Impurities

Atorvastatin 3-Oxopropyl Impurity

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CAS No.

: 110862-46-9

Mol F.

: C29H27FN2O2

Mol W.

: 454.54

Cat No.

: SA17823

Atorvastatin, Impurities

Atorvastatin EP Impurity B

$450.00 25 mg

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CAS No.

: 842103-12-2

Mol F.

: C33H35N2O5

Mol W.

: 558.64

Cat No.

: SA17810

Atorvastatin, Impurities

Atorvastatin EP Impurity D

$450.00 25 mg

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CAS No.

: 148146-51-4

Mol F.

: C26H22FNO4

Mol W.

: 431.46

Cat No.

: SA17812

Atropine, Impurities

Atropine

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CAS No.

: 51-55-8

Mol F.

: C17H23NO3

Mol W.

: 289.37

Cat No.

: SA47700

Atropine, Impurities

Atropine EP Impurity C

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CAS No.

: 552-63-6

Mol F.

: C9H10O3

Mol W.

: 166.17

Cat No.

: SA47703

Atropine, Impurities

Atropine EP Impurity D

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CAS No.

: 55869-99-3; 55449-49-5 (HBr)

Mol F.

: C17H23NO4

Mol W.

: 305.37

Cat No.

: SA47704

Atropine, Impurities

Atropine EP Impurity E

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CAS No.

: 949092-65-3

Mol F.

: C17H23NO4

Mol W.

: 305.37

Cat No.

: SA47705

Atropine, Impurities

Atropine EP Impurity F (HBr Trihydrate)

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CAS No.

: 6533-68-2

Mol F.

: C17H28BrNO7

Mol W.

: 438.31

Cat No.

: SA47706

Atropine, Impurities

Atropine EP Impurity G

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CAS No.

: 21956-47-8 (Base)

Mol F.

: C17H23NO3

Mol W.

: 289.37

Cat No.

: SA47707

Avatrombopag, Impurities

Avatrombopag 5-Chloro Acid Impurity

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CAS No.

: NA

Mol F.

: C29H34Cl2N6O3S2

Mol W.

: 649.70000000000005

Cat No.

: SA43906

Avatrombopag, Impurities

Avatrombopag Bromo Acid Impurity

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CAS No.

: NA

Mol F.

: C29H33BrCl2N6O3S2

Mol W.

: 728.5

Cat No.

: SA43903

Avatrombopag, Impurities

Avatrombopag Di Acid Impurity

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CAS No.

: 958457-83-5

Mol F.

: C12H13ClN2O4

Mol W.

: 284.7

Cat No.

: SA43902

Avatrombopag, Impurities

Avatrombopag Diamide Impurity

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CAS No.

: NA

Mol F.

: C46H55Cl3N10O2S4

Mol W.

: 1014.6

Cat No.

: SA43905

Avatrombopag, Impurities

Avatrombopag Ester Impurity

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CAS No.

Mol F.

: C31H38Cl2N6O3S2 : C3H7NO

Mol W.

: 677.7: 73.1

Cat No.

: SA43904